President Donald Trump said Thursday that a possible military strike against Syria "could be very soon or not so soon at all".

"Never said when an attack on Syria would take place," Trump wrote on Twitter.

Never said when an attack on Syria would take place. Could be very soon or not so soon at all! In any event, the United States, under my Administration, has done a great job of ridding the region of ISIS. Where is our “Thank you America?”

Trump's morning tweet followed opening remarks on Fox News' "Fox and Friends," in which the show's hosts debated when a military strike could come.

"Russia is apparently tracking our ships, because we deployed at least one ship," show co-host Ainsley Earhardt had commented. "There was one already there in the region. Russia is tracking our ships. They were seen removing 11 of their ships off of the coast of Syria. I don't know if that was to get their ships out of the way or to get in place so they can shoot down our missiles if we shoot them."

Steve Doocy, another co-host, responded that Russia knows "something is coming because the president yesterday eliminated the element of surprise. Nonetheless, there are these stories from Russia, hey, Syria didn't do it. Just know that because if you shoot something at us, United States, we're going to shoot your stuff down."Co-host, Brian Kilmeade, added that "this president at this moment has credibility. If he takes a backwards step now and doesn't follow through, I don't care how long it takes, we will almost never recover as long as he is in office...we have a responsibility to act like that and when we say we're going to do something, everything is on the line if we don't do it. The president will never recover from this internationally."

Trump's tweet also comes a day after the president posted a warning to Russia to "get ready" because the United States would be shooting missiles into Syria to respond to a suspected chemical weapons attack on a rebel-held suburb of Damascus last weekend that killed dozens of people, including women and children.

In that tweet, Trump wrote: “Russia vows to shoot down any and all missiles fired at Syria. Get ready Russia, because they will be coming, nice and new and “smart! You shouldn’t be partners with a Gas Killing Animal who kills his people and enjoys it!”

The tweets come as the president is weighing, for the second time in less than a year, a military response to a gas attack in Syria. Last year, he ordered an attack to a single Syrian air base, which left few damages, but this time, he's under pressure to take a harder hit.

President Donald Trump said Thursday that a possible military strike against Syria "could be very soon or not so soon at all"."Never said when an attack on Syria would take place," Trump wrote on Twitter.